[postgis] Upgrading Instructions

[Dave Blasby]

> Note to Dave, since you're changing the canonical text format while
> added SRIDS and precision grids:
> 
>   It is important that a dump of an older PostGIS database be always
> uploadable into a newer PostGIS database, otherwise our users will rise
> up and march upon us, carrying flaming brands and demanding retribution,
> etc etc.

If you restore a 0.5 database into the CVS version you'll get the same
geometry with a SRID of -1.

dave

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